Kear made his Super League début on 22 August 2009 at Rodney Parade in Newport against the Leeds Rhinos.[6] He was named man of the match after making several fine try-saving tackles against the eventual Super League champions. He also played in Celtic Crusaders final two games of the season against Huddersfield Giants and Castleford Tigers. On 7 October 2009, Kear signed his first professional contract at Celtic Crusaders for the 2010 season, hoping to cement his place as the first choice full back at the club, under new head coach Brian Noble.

In May 2010 Kear was recalled to the Crusaders first team playing in the Challenge cup 4th Round loss at Leeds Rhinos. Playing on the Left wing Kear made the first Crusaders try and scored a second half try in a performance that earn't him praise from the commentators and his coach Iestyn Harris.

The following game Kear played an important part in the crucial win over the Wakefield Trinity Wildcats which also saw him selected in the Frontline index Super League team of Round 14.

Kear signed for the London Broncos in 2015 and resigned for a further 2 years in 2016. He was awarded the No 1 shirt as starting Fullback for the 2017 season. On Sunday 12 February 2017 he played his 50th game for the Broncos at home against Hull KR.

On 21 November 2014, Kear switched codes to rugby union as he signed for London Welsh, who compete in England's top rugby union competition, the Aviva Premiership from the 2014-15 season.[7] Kear made his début on 7 December 2014 against Edinburgh Rugby in the European Challenge Cup at Murrayfield. Kear made his first Aviva Premiership start against Saracens on Saturday 20 December scoring a try on his début at the Allianze Stadium in the away loss.

Kear won his first full International cap when he started as full back against England on 17 October 2009. He scored his first try for Wales on 25 October 2009, in their 88-8 victory over Serbia in the European Cup. A week later he scored his second try in Welsh colours, during their 42-12 win over Ireland in the European Cup. In the final against Scotland he scored another try for the Welsh and was voted man of the match in their 28-16 victory.

In 2010 he represented Wales in the Alitalia European Cup, scoring a hat-trick against Scotland. Playing in his second European Cup final Wales went on to beat France 12 -10 in Albi, the French paper La Depeche vote him as man of the match.

Kear scored a try in the 32-16 loss against Italy. Kear played against the USA and Cook Islands where he was named Man of the Match and selected at Fullback in the Rugby League World Cup Team of round 3.

Kear was selected in the Dragons team for the 2014 European Cup However he was unable to join the squad as he had recently changed codes to join London Welsh. He was selected for the 2015 European Cup tournament and played in all 3 games at Fullback, scoring a try in a Man of the Match display in the Final game against Ireland to ensure Wales secured their second European Championship.